/*
 * Copyright 2025, AutoMQ HK Limited.
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package kafka.automq.table.transformer;

import org.apache.iceberg.Schema;
import org.apache.iceberg.data.Record;

import java.util.function.Supplier;

public class LazyRegistrySchemaConvert implements Converter {
    private final Supplier<Converter> converterSupplier;
    private volatile Converter delegate;

    public LazyRegistrySchemaConvert(Supplier<Converter> converterSupplier) {
        this.converterSupplier = converterSupplier;
    }

    protected Converter getDelegate() {
        if (delegate == null) {
            synchronized (this) {
                if (delegate == null) {
                    delegate = converterSupplier.get();
                    if (delegate == null) {
                        throw new IllegalStateException("Converter supplier returned null");
                    }
                }
            }
        }
        return delegate;
    }

    @Override
    public Record convert(org.apache.kafka.common.record.Record record) {
        return getDelegate().convert(record);
    }

    @Override
    public void tableSchema(Schema tableSchema) {
        getDelegate().tableSchema(tableSchema);
    }

    @Override
    public SchemaState currentSchema() {
        return getDelegate().currentSchema();
    }

    @Override
    public long fieldCount() {
        return getDelegate().fieldCount();
    }
}
